Fire-door



A. DUEWEKE.

FIRE DOOR.

APPLICATION FILED JUNE 11, 1919.

1,332,'1 1 1. Patented Feb. 24,1920.

. ALEXAHDER DUEWEKE, OF-DETROITQMICHIGAN;

FIRE-DOOR.

Specification of Letters Patent.

Patented Feb. 24, 1920.

Application filed June 17, 1919. Serial No. 304,767.

To all whom it may concern:

Be it known that I, ALEXANDER DUEWEKE, a citizen of the United States, residing at 362 Parker AveQ, Detroit, in the county of Wayne and State of Michigan, have in vented certain new and useful Improvements in Fire-Doors, of which the following is a specification.

This invention relates to fire doors of that type which close by gravity and are controlled by a fusible device which will melt in the presence of sufficient heat and permit the door to close.

The object of the invention is to provide improved means for holding the door in open position and for efiecting the release thereof under the proper conditions.

The invention is illustrated in the accompanying drawings in which Figure 1 is a side elevation of the door. Fig. 2 is a section on the line 2-2 of Fig. 1. Fig. 3 is a detail of a bridge piece on the track.

Referring particularly to the drawings 6 indicates the doorway, 7 the sliding door hung by wheeled hangers 8 on a track 9 which is inclined downwardly toward the doorway so that the door will tend to close by gravity.

The lower edge of the track has one or more notches 10 in which a pivoted latch 11, carried by the door, may be engaged. This latch is pivoted at 12 near the upper edge of the door so that its head 13 will travel along the lower edge of the door and will engage in a notch to hold the door open when desired. The tail 14: of the latch is heavier than the head, so that the head is held against the lower edge of the track and will lift into the notches- The latch is operated bya lever 15 which is pivoted at 16 to a bracket 17 on the door,

which bracket also has a stop 18 which limits the drop of the latch. The lever is located to strike and lift the tail of the latch and thereby drop the head from the notch, the lever being provided with a weight 18 at its rear end to produce this operation.

The lever is normally held in inoperative position by a fusible link 19 connecting the front end thereof to a stud 20 on the door. When the fuse melts the weight throws the lever which releases the latch, and the door is free to roll down the track to closed positlon.

The track is provided at each notch with a brldge piece 21 pivoted thereto at 22 and arranged to lap or bridge the notch. In its normal position the end v33 of the bridge piece toward the doorway hangs slightly below the lower edge of the track 9, and when the door is opened the latch will strike the bridge piece and swing the same "rearwardly, thereby uncovering the notch and permitting the latch head to lift into the same, thereby holding the door in open position. The other end 24 of the bridge piece is flush with the lower end of the track, so that when the door slides down the track the latch will ride under the bridge piece and across the notch, and accordingly the door will not be stopped in its closing movement. 25 is a keeper to limit the swing of the bridge piece. If only one notch is provided this bridge piece may be omitted, but when more than one notch is provided, to hold the door more or less open, the bridge piece is necessary to allow the latch to pass over the notch nearest the doorway. I

By the means described the door will automatically close in the presence of fire or heat suflicient to melt the fusiblelink.

I claim:

1. The combination with an inclined track having a notch, of a sliding door hung on said track, a thermally controlled latch carried by the door and engageable in said notch to hold the door open, and a swinging bridge piece pivoted beside the track and adapted to lap said notch and prevent the engagement of the latch therein when the door moves toward closed position.

2. The combination with an inclined track having a notch, of a sliding door hung on said track, a latch pivoted to the door and engageable in said notch to hold the door open, a weighted trip-lever pivoted on the door and arranged to strike and release the latch, and a fusible link connected to the lever and holding the same in inoperative position.

3. The combination with an inclined track having a notch in its lower edge, of a sliding door hung on the track, a latch carried by the door in contact with said edge and engageable in said notch to hold the door open, and a bridge piece pivoted to the track above the notch and. normally bridg; ing theasame, the end of said bridge piece toward the doorway projecting sli htly below the track, to be struck by the etch and swung to uncover the notch. and permit the latch to engage therein when the door is opened, and the opposite'end of the bridge piece being flush with said edge of the track, 10 I to allow the latch to pass thereover when the door movesto closed position,

I a In testimon whereof I aflix my signature in presence of two witnesses. V ALEXANDER DUEWEKE. Witnesses: V

WILLIAM C. MILLER, IDA HAGEN. 

